Headphone



FIG. 1 is a perspective view of a headphone.

FIG. 2 is another perspective view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a top view thereof.

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a back view thereof. 

The ornamental design for a headphone, as shown and described. 